A 15 cm x 15 cm circuit board dissipating 20 W of power uniformly is cooled by air, which approaches the circuit board at 20°C with a velocity of 6 m/s. Disregarding any heat transfer from the back surface of the board, determine the surface temperature of the electronic components (a) at the leading edge and (b) at the end of the board. Assume the flow to be turbulent since the electronic components are expected to act as turbulators.

(a) Surface temperature at the leading edge = 49.9°C

(b)  Surface temperature at the end of the board = 51.1°C

Explanation:

See the attached files for the calculation

answer:

a

explanation:

answer:

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explanation:

d. represents both (b) and (c).

more logical as well.

b and c are to complicated.

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